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                                <h1 id="&#x8BFB;&#x8BBA;&#x6587;&#x7CFB;&#x5217;&#xB7;faster-rcnn">&#x8BFB;&#x8BBA;&#x6587;&#x7CFB;&#x5217;&#xB7;Faster RCNN</h1>
<blockquote>
<p>&#x8F6C;&#x8F7D;&#x8BF7;&#x6CE8;&#x660E;&#x4F5C;&#x8005;&#xFF1A;<a href="https://github.com/ahangchen" target="_blank">&#x68A6;&#x91CC;&#x8336;</a></p>
</blockquote>
<p>Faster RCNN&#x5728;Fast RCNN&#x4E0A;&#x66F4;&#x8FDB;&#x4E00;&#x6B65;&#xFF0C;&#x5C06;Region Proposal&#x4E5F;&#x7528;&#x795E;&#x7ECF;&#x7F51;&#x7EDC;&#x6765;&#x505A;&#xFF0C;&#x5982;&#x679C;&#x8BF4;Fast RCNN&#x7684;&#x6700;&#x5927;&#x8D21;&#x732E;&#x662F;ROI pooling layer&#x548C;Multi task&#xFF0C;&#x90A3;&#x4E48;RPN&#xFF08;Region Proposal Networks&#xFF09;&#x5C31;&#x662F;Faster RCNN&#x7684;&#x6700;&#x5927;&#x4EAE;&#x70B9;&#x4E86;&#x3002;&#x4F7F;&#x7528;RPN&#x4EA7;&#x751F;&#x7684;proposals&#x6BD4;selective search&#x8981;&#x5C11;&#x5F88;&#x591A;&#xFF08;300vs2000&#xFF09;,&#x56E0;&#x6B64;&#x4E5F;&#x4E00;&#x5B9A;&#x7A0B;&#x5EA6;&#x4E0A;&#x51CF;&#x5C11;&#x4E86;&#x540E;&#x9762;detection&#x7684;&#x8BA1;&#x7B97;&#x91CF;&#x3002;</p>
<h2 id="introduction">Introduction</h2>
<p>Fast RCNN&#x4E4B;&#x540E;&#xFF0C;detection&#x7684;&#x8BA1;&#x7B97;&#x74F6;&#x9888;&#x5C31;&#x5361;&#x5728;&#x4E86;Region Proposal&#x4E0A;&#x3002;&#x4E00;&#x4E2A;&#x91CD;&#x8981;&#x539F;&#x56E0;&#x5C31;&#x662F;&#xFF0C;Region Proposal&#x662F;&#x7528;CPU&#x7B97;&#x7684;&#xFF0C;&#x4F46;&#x662F;&#x76F4;&#x63A5;&#x5C06;&#x5176;&#x7528;GPU&#x5B9E;&#x73B0;&#x4E00;&#x904D;&#x4E5F;&#x6709;&#x95EE;&#x9898;&#xFF0C;&#x8BB8;&#x591A;&#x63D0;&#x53D6;&#x89C4;&#x5219;&#x5176;&#x5B9E;&#x662F;&#x53EF;&#x4EE5;&#x91CD;&#x7528;&#x7684;&#xFF0C;&#x56E0;&#x6B64;&#x6709;&#x5FC5;&#x8981;&#x627E;&#x4E00;&#x79CD;&#x80FD;&#x591F;&#x5171;&#x4EAB;&#x7B97;&#x529B;&#x7684;GPU&#x7248;Region Proposal&#x3002;</p>
<p>Faster RCNN&#x5219;&#x662F;&#x4E13;&#x95E8;&#x8BAD;&#x7EC3;&#x4E86;&#x4E00;&#x4E2A;&#x5377;&#x79EF;&#x795E;&#x7ECF;&#x7F51;&#x7EDC;&#x6765;&#x56DE;&#x5F52;bounding box&#xFF0C;&#x4ECE;&#x800C;&#x4EE3;&#x66FF;region proposal&#x3002;&#x8FD9;&#x4E2A;&#x7F51;&#x7EDC;&#x5B8C;&#x5168;&#x7531;&#x5377;&#x79EF;&#x64CD;&#x4F5C;&#x5B9E;&#x73B0;&#xFF0C;&#x5E76;&#x4E14;&#x5F15;&#x5165;anchor&#x4EE5;&#x5E94;&#x5BF9;&#x5BF9;&#x8C61;&#x5F62;&#x72B6;&#x5C3A;&#x5BF8;&#x5404;&#x5F02;&#x7684;&#x95EE;&#x9898;&#xFF0C;&#x6D4B;&#x8BD5;&#x901F;&#x5EA6;&#x4E0E;Fast RCNN&#x76F8;&#x6BD4;&#x901F;&#x5EA6;&#x6781;&#x5FEB;&#x3002;</p>
<p>&#x8FD9;&#x4E2A;&#x7F51;&#x7EDC;&#x53EB;&#x505A;region proposal layer.</p>
<h2 id="rpn">RPN</h2>
<p><img src="faster_rcnn_0.png" alt="">
&#x8BAD;&#x7EC3;&#x6570;&#x636E;&#x5C31;&#x662F;&#x56FE;&#x7247;&#x548C;bounding box</p>
<ul>
<li>&#x8F93;&#x5165;&#x4EFB;&#x610F;&#x5C3A;&#x5BF8;&#x7684;&#x56FE;&#x7247;&#xFF0C;&#x7F29;&#x653E;&#x5230;1000&#xD7;600</li>
<li>&#x8F93;&#x5165;&#x5230;&#x4E00;&#x4E2A;&#x57FA;&#x7840;&#x5377;&#x79EF;&#x795E;&#x7ECF;&#x7F51;&#x7EDC;&#xFF0C;&#x6BD4;&#x5982;ZF&#x6216;&#x8005;VGG&#xFF0C;&#x4EE5;ZF&#x4E3A;&#x4F8B;&#xFF0C;&#x5F97;&#x5230;&#x4E00;&#x4E2A;51&#xD7;39&#x7684;feature map</li>
<li>&#x7528;&#x4E00;&#x4E2A;&#x5C0F;&#x7684;&#x7F51;&#x7EDC;&#x5728;feature map&#x4E0A;&#x6ED1;&#x7A97;&#xFF0C;&#x7B97;&#x6BCF;&#x4E2A;3x3&#x7A97;&#x53E3;&#x7684;feature&#xFF0C;&#x8F93;&#x51FA;&#x4E00;&#x4E2A;&#x957F;&#x5EA6;&#x4E3A;256&#x7684;&#x5411;&#x91CF;&#xFF0C;&#x8FD9;&#x4E2A;&#x64CD;&#x4F5C;&#x5F88;&#x81EA;&#x7136;&#x5C31;&#x662F;&#x7528;3&#xD7;3&#x5377;&#x79EF;&#x6765;&#x5B9E;&#x73B0;&#xFF0C;&#x4E8E;&#x662F;&#x53EF;&#x4EE5;&#x5F97;&#x5230;&#x4E00;&#x4E2A;51&#xD7;39&#xD7;256&#x7684;feature map</li>
<li><p>&#x6BCF;&#x4E2A;256&#x5411;&#x91CF;&#x8DDF;feature map&#x4E0A;&#x4E00;&#x4E2A;3&#xD7;3&#x7A97;&#x53E3;&#x5BF9;&#x5E94;&#xFF0C;&#x4E5F;&#x8DDF;800&#xD7;600&#x7684;&#x539F;&#x56FE;&#x4E0A;9&#x4E2A;&#x533A;&#x57DF;&#x76F8;&#x5BF9;&#x5E94;&#xFF0C;&#x5177;&#x4F53;&#x8BB2;&#x4E00;&#x4E0B;&#x8FD9;&#x4E2A;9&#x4E2A;&#x533A;&#x57DF;&#xFF1A;</p>
<ul>
<li>&#x5377;&#x79EF;&#x540E;feature map&#x4E0A;&#x7684;&#x6BCF;&#x4E2A;3x3&#x7684;&#x533A;&#x57DF;&#x5BF9;&#x5E94;&#x539F;&#x56FE;&#x4E0A;&#x4E00;&#x4E2A;&#x6BD4;&#x8F83;&#x5927;&#x7684;&#x611F;&#x53D7;&#x91CE;&#xFF0C;&#x7528;ZF&#x505A;&#x524D;&#x9762;&#x7684;&#x5377;&#x79EF;&#x5C42;&#xFF0C;&#x611F;&#x53D7;&#x91CE;&#x4E3A;171&#xD7;171&#xFF0C;&#x7528;VGG&#x611F;&#x53D7;&#x91CE;&#x4E3A;228&#xD7;228</li>
<li>&#x6211;&#x4EEC;&#x60F3;&#x7528;feature map&#x6765;&#x5224;&#x65AD;&#x5B83;&#x7684;&#x611F;&#x53D7;&#x91CE;&#x662F;&#x5426;&#x662F;&#x524D;&#x666F;&#xFF0C;&#x4ECE;&#x800C;&#x5C06;&#x611F;&#x53D7;&#x91CE;&#x4F5C;&#x4E3A;proposal&#xFF0C;&#x4F46;&#x662F;&#x5BF9;&#x8C61;&#x5E76;&#x4E0D;&#x603B;&#x662F;&#x6B63;&#x65B9;&#x5F62;&#x7684;&#xFF0C;&#x4E8E;&#x662F;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x5BF9;&#x611F;&#x53D7;&#x91CE;&#x505A;&#x4E00;&#x4E2A;&#x66FF;&#x6362;&#xFF0C;&#x5F97;&#x5230;&#x591A;&#x79CD;&#x5F62;&#x72B6;&#x7684;proposal</li>
<li>&#x6211;&#x4EEC;&#x8BA9;&#x6BCF;&#x4E2A;3x3&#x7684;&#x533A;&#x57DF;&#xFF08;&#x56FE;&#x4E2D;&#x6A59;&#x8272;&#x65B9;&#x683C;&#xFF09;&#x548C;&#x539F;&#x56FE;&#x4E0A;&#x4E5D;&#x4E2A;&#x533A;&#x57DF;&#x76F8;&#x5BF9;&#x5E94;&#xFF0C;&#x8FD9;&#x4E5D;&#x4E2A;&#x533A;&#x57DF;&#x7684;&#x4E2D;&#x5FC3;&#xFF08;&#x7070;&#x8272;&#x65B9;&#x683C;&#xFF09;&#x5C31;&#x662F;&#x611F;&#x53D7;&#x91CE;&#x7684;&#x4E2D;&#x5FC3;</li>
<li>&#x4E5D;&#x4E2A;&#x533A;&#x57DF;&#x6709;&#x4E5D;&#x79CD;&#x5C3A;&#x5BF8;&#x5206;&#x522B;&#x662F;</li>
</ul>
<blockquote>
<p>128x128 128x64 64x128</p>
<p>256x256 256x128 128x256</p>
<p>512x512 512x256 256x512</p>
</blockquote>
<ul>
<li>&#x8FD9;&#x4E5D;&#x4E2A;&#x533A;&#x57DF;&#x6211;&#x4EEC;&#x4E5F;&#x6210;&#x4E3A;9&#x4E2A;anchor&#xFF0C;&#x6216;&#x8005;9&#x4E2A;reference box</li>
<li>&#x5982;&#x6B64;&#xFF0C;&#x6BCF;&#x4E2A;&#x7279;&#x5F81;&#x5C31;&#x80FD;&#x548C;&#x539F;&#x56FE;&#x4E0A;&#x5F62;&#x72B6;&#x548C;&#x5C3A;&#x5BF8;&#x5404;&#x5F02;&#x7684;&#x533A;&#x57DF;&#x5BF9;&#x5E94;&#x8D77;&#x6765;&#x4E86;</li>
</ul>
</li>
<li><p>&#x56DE;&#x5230;&#x521A;&#x521A;&#x7684;256&#x5411;&#x91CF;&#xFF0C;&#x5C06;&#x8FD9;&#x4E2A;&#x5411;&#x91CF;&#x8F93;&#x5165;&#x4E00;&#x4E2A;FC&#xFF0C;&#x5F97;&#x5230;2x9&#x4E2A;&#x8F93;&#x51FA;&#xFF0C;&#x4EE3;&#x8868;9&#x4E2A;anchor&#x4E3A;&#x524D;&#x666F;&#x8FD8;&#x662F;&#x80CC;&#x666F;&#x7684;&#x6982;&#x7387;</p>
<ul>
<li>&#x5B66;&#x4E60;&#x7528;&#x7684;&#x6807;&#x7B7E;&#x8BBE;&#x7F6E;&#xFF1A;&#x5982;&#x679C;anchor&#x4E0E;&#x771F;&#x5B9E;bounding box&#x91CD;&#x53E0;&#x7387;&#x5927;&#x4E8E;0.7&#xFF0C;&#x5C31;&#x5F53;&#x505A;&#x662F;&#x524D;&#x666F;&#xFF0C;&#x5982;&#x679C;&#x5C0F;&#x4E8E;0.3&#xFF0C;&#x5C31;&#x5F53;&#x505A;&#x80CC;&#x666F;</li>
</ul>
</li>
<li>&#x5C06;256&#x5411;&#x91CF;&#x8F93;&#x5165;&#x53E6;&#x4E00;&#x4E2A;FC&#xFF0C;&#x5F97;&#x5230;4x9&#x4E2A;&#x8F93;&#x51FA;&#xFF0C;&#x4EE3;&#x8868;9&#x4E2A;anchor&#x7684;&#x4FEE;&#x6B63;&#x540E;&#x7684;&#x4F4D;&#x7F6E;&#x4FE1;&#x606F;(x,y,w,h)<ul>
<li>&#x5B66;&#x4E60;&#x7528;&#x7684;&#x6807;&#x7B7E;&#x5C31;&#x662F;&#x771F;&#x5B9E;&#x7684;bounding box&#xFF0C;&#x7528;&#x7684;&#x8FD8;&#x662F;&#x4E4B;s&#x524D;Faster RCNN&#x7684;bounding box regression</li>
</ul>
</li>
</ul>
<blockquote>
<p>&#x4E24;&#x4E2A;FC&#x5728;&#x5B9E;&#x73B0;&#x7684;&#x65F6;&#x5019;&#x662F;&#x5206;&#x522B;&#x7528;&#x4E24;&#x4E2A;1x1&#x5377;&#x79EF;&#x5B9E;&#x73B0;&#x7684; <img src="https://upload-images.jianshu.io/upload_images/1828517-c23f035a21b10c24.png?imageMogr2/auto-orient/strip|imageView2/2/w/1240" alt="FC"> &#x4EE5;&#x6A59;&#x8272;&#x4E3A;&#x4F8B;&#xFF0C;256&#x5411;&#x91CF;&#x548C;W1&#x77E9;&#x9635;&#x76F8;&#x4E58;&#xFF0C;&#x5F97;&#x5230;&#x957F;&#x5EA6;&#x4E3A;18&#x7684;&#x5411;&#x91CF;&#xFF0C;&#x8FD9;&#x6837;&#x7684;&#x64CD;&#x4F5C;&#x5728;51x39&#x4E2A;feature&#x90FD;&#x8981;&#x505A;&#x4E00;&#x904D;&#xFF0C;&#x5B9E;&#x73B0;&#x8D77;&#x6765;&#x5C31;&#x5F88;&#x81EA;&#x7136;&#x53D8;&#x6210;&#x4E86;&#x7528;&#x4E00;&#x4E2A;1x1&#x7684;&#x5377;&#x79EF;&#x6838;&#x5728;feature map&#x4E0A;&#x505A;&#x5377;&#x79EF;&#x5566;&#xFF0C;&#x8FD9;&#x6837;&#x4E5F;&#x6697;&#x542B;&#x4E86;&#x4E00;&#x4E2A;&#x5047;&#x8BBE;&#xFF0C;&#x4E0D;&#x540C;&#x4F4D;&#x7F6E;&#x7684;slide window&#x5BF9;&#x4E8E;anchor&#x7684;&#x504F;&#x597D;&#x662F;&#x76F8;&#x540C;&#x7684;&#xFF0C;&#x662F;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x6570;&#x91CF;&#x4E0E;&#x7CBE;&#x5EA6;&#x7684;&#x6743;&#x8861;&#x95EE;&#x9898;&#x3002;</p>
</blockquote>
<ul>
<li>&#x4E8E;&#x662F;&#x6211;&#x4EEC;&#x4F1A;&#x5F97;&#x5230;&#x56FE;&#x7247;&#x4E0A;51x39x9&#x2248;20K&#x4E2A;anchor&#x4E3A;&#x524D;&#x666F;&#x7684;&#x6982;&#x7387;&#xFF0C;&#x4EE5;&#x53CA;&#x4FEE;&#x6B63;&#x540E;&#x7684;&#x4F4D;&#x7F6E;</li>
</ul>
<p>&#x4E0A;&#x9762;&#x8FD9;&#x4E2A;&#x8FC7;&#x7A0B;&#x53EF;&#x4EE5;&#x5B8C;&#x5168;&#x72EC;&#x7ACB;&#x5730;&#x8BAD;&#x7EC3;&#xFF0C;&#x5F97;&#x5230;&#x4E00;&#x4E2A;&#x5F88;&#x597D;&#x7684;Region Proposal Network</p>
<p>&#x7406;&#x8BBA;&#x4E0A;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x7528;&#x4E0A;&#x9762;&#x8FD9;&#x4E2A;&#x6D41;&#x7A0B;&#x53BB;&#x8BAD;&#x7EC3;RPN&#xFF0C;&#x4F46;&#x8BAD;&#x7EC3;RPN&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x4E00;&#x4E2A;batch&#x4F1A;&#x76F4;&#x63A5;&#x8DD1;20K&#x4E2A;anchor&#x5F00;&#x9500;&#x592A;&#x5927;&#x4E86;&#x3002;</p>
<ul>
<li>&#x56E0;&#x6B64;&#x6BCF;&#x4E2A;batch&#x662F;&#x91C7;&#x4E00;&#x5F20;&#x56FE;&#x91CC;&#x7684;256&#x4E2A;anchor&#x6765;&#x8BAD;&#x7EC3;&#x5168;&#x8FDE;&#x63A5;&#x5C42;&#x548C;&#x5377;&#x79EF;&#x5C42;&#xFF1B;</li>
<li>&#x8FD9;256&#x4E2A;anchor&#x91CC;&#x6B63;&#x8D1F;&#x6837;&#x672C;&#x6BD4;&#x4F8B;&#x4E3A;1:1&#xFF0C;&#x6B63;&#x6837;&#x672C;128&#x4E2A;&#xFF0C;&#x8D1F;&#x6837;&#x672C;128&#x4E2A;&#xFF0C;</li>
<li>&#x5982;&#x679C;&#x6B63;&#x6837;&#x672C;&#x4E0D;&#x8DB3;128&#x4E2A;&#xFF0C;&#x7528;&#x8D1F;&#x6837;&#x672C;&#x586B;&#x5145;&#xFF0C;&#x8FD9;&#x4E5F;&#x610F;&#x5473;&#x7740;&#x5E76;&#x975E;&#x6240;&#x6709;&#x7684;&#x80CC;&#x666F;anchor&#x90FD;&#x4F1A;&#x62FF;&#x6765;&#x8BAD;&#x7EC3;RPN&#xFF0C;&#x56E0;&#x4E3A;&#x524D;&#x666F;&#x7684;anchor&#x4F1A;&#x8FDC;&#x5C11;&#x4E8E;&#x80CC;&#x666F;&#x7684;anchor&#xFF0C;&#x4E22;&#x6389;&#x4E00;&#x4E9B;&#x80CC;&#x666F;anchor&#x624D;&#x80FD;&#x4FDD;&#x8BC1;&#x6837;&#x672C;&#x5E73;&#x8861;&#xFF0C;&#x4E22;&#x80CC;&#x666F;anchor&#x7684;&#x65F6;&#x5019;&#x662F;&#x4EE5;slide window&#x4E3A;&#x5355;&#x4F4D;&#x4E22;&#x7684;&#xFF0C;&#x4E0B;&#x9762;&#x4F1A;&#x8BF4;&#x660E;&#x3002;</li>
<li>&#x5177;&#x4F53;&#x5B9E;&#x73B0;&#x4E0A;&#xFF0C;&#x5148;&#x7B97;&#x6240;&#x6709;anchor&#xFF0C;&#x518D;&#x7B97;&#x6240;&#x6709;anchor&#x4E0E;bounding box&#x7684;&#x91CD;&#x53E0;&#x7387;&#xFF0C;&#x6309;&#x91CD;&#x53E0;&#x7387;&#x533A;&#x5206;&#x6B63;&#x8D1F;&#x6837;&#x672C;&#xFF0C;&#x7136;&#x540E;&#x9009;&#x62E9;batch&#x4E2D;&#x7684;256&#x4E2A;anchor&#xFF0C;&#x53C2;&#x4E0E;&#x8BAD;&#x7EC3;&#x3002;&#x540C;&#x4E00;&#x5F20;&#x56FE;&#x4F1A;&#x591A;&#x6B21;&#x53C2;&#x4E0E;&#x8BAD;&#x7EC3;&#xFF0C;&#x76F4;&#x5230;&#x56FE;&#x4E2D;&#x7684;&#x6B63;anchor&#x7528;&#x5B8C;&#x3002;</li>
</ul>
<p>&#x56E0;&#x6B64;&#x6700;&#x7EC8;&#x7684;&#x4E00;&#x4E2A;mini batch&#x7684;&#x8BAD;&#x7EC3;&#x635F;&#x5931;&#x51FD;&#x6570;&#x4E3A;&#xFF1A;</p>
<p><img src="faster_rcnn_1.png" alt="">
&#x5176;&#x4E2D;&#xFF0C;</p>
<ul>
<li><script type="math/tex; ">p_{i}</script>&#x662F;&#x4E00;&#x4E2A;batch&#x4E2D;&#x7684;&#x591A;&#x4E2A;anchor&#x5C5E;&#x4E8E;&#x524D;&#x666F;/&#x540E;&#x666F;&#x7684;&#x9884;&#x6D4B;&#x6982;&#x7387;&#x5411;&#x91CF;&#xFF0C;<script type="math/tex; ">t_{i}</script>&#x662F;&#x4E00;&#x4E2A;batch&#x4E2D;&#x6B63;anchor&#x5BF9;&#x5E94;&#x7684;bounding box&#x4F4D;&#x7F6E;&#x5411;&#x91CF;</li>
<li><script type="math/tex; ">L_{cls}</script>&#x662F;softmax&#x4E8C;&#x5206;&#x7C7B;&#x635F;&#x5931;</li>
<li><script type="math/tex; ">L_{reg}</script>&#x8DDF;Fast RCNN&#x4E2D;&#x7684;bounding box regression loss&#x4E00;&#x6837;&#xFF0C;&#x4E58;&#x4E00;&#x4E2A;<script type="math/tex; ">p_{i}*</script> &#xFF0C;&#x610F;&#x5473;&#x7740;&#x53EA;&#x6709;&#x524D;&#x666F;&#x8BA1;&#x7B97;bounding box regression loss</li>
<li>&#x8BBA;&#x6587;&#x4E2D;&#x8BF4;<script type="math/tex; ">N_{cls}</script>&#x4E3A;256&#xFF0C;&#x4E5F;&#x5C31;&#x662F;mini-batch size&#xFF0C;<script type="math/tex; ">N_{reg}</script>&#x7EA6;&#x4E3A;256 * 9=2304&#xFF08;&#x8BBA;&#x6587;&#x4E2D;&#x8BF4;&#x7EA6;&#x7B49;&#x4E8E;2400&#xFF09;,&#x8FD9;&#x610F;&#x5473;&#x7740;&#x4E00;&#x5BF9;p&#x5BF9;&#x5E94;9&#x4E2A;t&#xFF0C;&#x8FD9;&#x79CD;&#x5BF9;&#x5E94;&#x5173;&#x7CFB;&#x4E5F;&#x4F53;&#x73B0;&#x5728;&#x5168;&#x8FDE;&#x63A5;&#x5C42;&#x7684;&#x8F93;&#x51FA;&#x4E2A;&#x6570;&#x4E0A;&#xFF0C;&#x7531;&#x4E8E;&#x4E24;&#x4E2A;task&#x8F93;&#x51FA;&#x6570;&#x91CF;&#x5DEE;&#x522B;&#x6BD4;&#x8F83;&#x5927;&#xFF0C;&#x6240;&#x4EE5;&#x8981;&#x505A;&#x4E00;&#x4E0B;&#x5F52;&#x4E00;&#x5316;&#x3002;</li>
</ul>
<blockquote>
<p>&#x4F46;&#x8FD9;&#x5C31;&#x610F;&#x5473;&#x7740;loss&#x4E2D;&#x7684;mini-batch size&#x662F;&#x4EE5;3x3&#x7684;slide window&#x4E3A;&#x5355;&#x4F4D;&#x7684;&#xFF0C;&#x56E0;&#x4E3A;&#x53EA;&#x6709;slide window&#x548C;anchor&#x7684;&#x4E2A;&#x6570;&#x624D;&#x6709;&#x8FD9;&#x79CD;1:9&#x7684;&#x5173;&#x7CFB;&#xFF0C;&#x800C;&#x6311;&#x9009;&#x8BAD;&#x7EC3;&#x6837;&#x672C;&#x8BB2;&#x7684;mini-batch size&#x5374;&#x662F;&#x4EE5;anchor&#x4E3A;&#x5355;&#x4F4D;&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x731C;&#x5B9E;&#x9645;&#x64CD;&#x4F5C;&#x662F;&#x8FD9;&#x6837;&#x7684;&#xFF1A;</p>
<ul>
<li>&#x5148;&#x9009;256&#x4E2A;anchor&#xFF0C;</li>
<li>&#x7136;&#x540E;&#x627E;&#x5B83;&#x4EEC;&#x5BF9;&#x5E94;&#x7684;256&#x4E2A;slide window&#xFF0C;</li>
<li>&#x7136;&#x540E;&#x518D;&#x7B97;&#x8FD9;256&#x4E2A;slide window&#x5BF9;&#x5E94;&#x7684;256&#xD7;9&#x4E2A;anchor&#x7684;loss&#xFF0C;&#x6BCF;&#x4E2A;slide window&#x5BF9;&#x5E94;&#x4E00;&#x4E2A;256&#x7279;&#x5F81;&#xFF0C;&#x6709;&#x4E00;&#x4E2A;<script type="math/tex; ">L_{cls}</script>&#xFF0C;&#x540C;&#x65F6;&#x5BF9;&#x5E94;9&#x4E2A;anchor&#xFF0C;&#x6709;9&#x4E2A;<script type="math/tex; ">L_{reg}</script></li>
</ul>
</blockquote>
<p>&#x8BBA;&#x6587;&#x8FD9;&#x91CC;&#x8BB2;&#x5F97;&#x8D85;&#x7EA7;&#x6DF7;&#x4E71;&#xFF0C;&#x53EF;&#x4EE5;&#x611F;&#x53D7;&#x4E0B;&#xFF1A;</p>
<p><img src="faster_rcnn_2.png" alt=""></p>
<h2 id="proposal-layer">Proposal layer</h2>
<p>&#x5176;&#x5B9E;&#x8FD9;&#x4E5F;&#x53EF;&#x4EE5;&#x7B97;&#x662F;RPN&#x7684;&#x4E00;&#x90E8;&#x5206;&#xFF0C;&#x4E0D;&#x8FC7;&#x8FD9;&#x90E8;&#x5206;&#x4E0D;&#x9700;&#x8981;&#x8BAD;&#x7EC3;&#xFF0C;&#x6240;&#x4EE5;&#x5355;&#x72EC;&#x62C9;&#x51FA;&#x6765;&#x8BB2;</p>
<ul>
<li>&#x63A5;&#x4E0B;&#x6765;&#x6211;&#x4EEC;&#x4F1A;&#x8FDB;&#x5165;&#x4E00;&#x4E2A;proposal layer&#xFF0C;&#x6839;&#x636E;&#x524D;&#x9762;&#x5F97;&#x5230;&#x7684;&#x8FD9;&#x4E9B;&#x4FE1;&#x606F;&#xFF0C;&#x6311;&#x9009;region&#x7ED9;&#x540E;&#x9762;&#x7684;fast rcnn&#x8BAD;&#x7EC3;<ul>
<li>&#x56FE;&#x7247;&#x8F93;&#x5165;RPN&#x540E;&#xFF0C;&#x6211;&#x4EEC;&#x624B;&#x5934;&#x7684;&#x4FE1;&#x606F;&#xFF1A;anchor&#xFF0C;anchor score&#xFF0C;anchor location to fix</li>
<li>&#x7528;&#x5168;&#x8FDE;&#x63A5;&#x5C42;&#x7684;&#x4F4D;&#x7F6E;&#x4FEE;&#x6B63;&#x7ED3;&#x679C;&#x4FEE;&#x6B63;anchor&#x4F4D;&#x7F6E;</li>
<li>&#x5C06;&#x4FEE;&#x6B63;&#x540E;&#x7684;anchor&#x6309;&#x7167;&#x524D;&#x666F;&#x6982;&#x7387;&#x4ECE;&#x9AD8;&#x5230;&#x5E95;&#x6392;&#x5E8F;&#xFF0C;&#x53D6;&#x524D;6000&#x4E2A;</li>
<li>&#x8FB9;&#x7F18;&#x7684;anchor&#x53EF;&#x80FD;&#x8D85;&#x51FA;&#x539F;&#x56FE;&#x7684;&#x8303;&#x56F4;&#xFF0C;&#x5C06;&#x4E25;&#x91CD;&#x8D85;&#x51FA;&#x8FB9;&#x7F18;&#x7684;anchor&#x8FC7;&#x6EE4;&#x6389;</li>
</ul>
</li>
</ul>
<p><img src="faster_rcnn_3.png" alt=""></p>
<ul>
<li>&#x5BF9;anchor&#x505A;&#x975E;&#x6781;&#x5927;&#x6291;&#x5236;&#xFF0C;&#x8DDF;RCNN&#x4E00;&#x6837;&#x7684;&#x64CD;&#x4F5C;</li>
<li>&#x518D;&#x6B21;&#x5C06;&#x5269;&#x4E0B;&#x7684;anchor&#x6309;&#x7167;anchor score&#x4ECE;&#x9AD8;&#x5230;&#x4F4E;&#x6392;&#x5E8F;&#xFF08;&#x4ECD;&#x7136;&#x53EF;&#x80FD;&#x6709;&#x80CC;&#x666F;anchor&#x7684;&#xFF09;&#xFF0C;&#x53D6;&#x524D;300&#x4E2A;&#x4F5C;&#x4E3A;proposals&#x8F93;&#x51FA;&#xFF0C;&#x5982;&#x679C;&#x4E0D;&#x8DB3;300&#x4E2A;&#x5C31;&#x2026;&#x4E5F;&#x6CA1;&#x5565;&#x5173;&#x7CFB;&#xFF0C;&#x6BD4;&#x5982;&#x53EA;&#x6709;100&#x4E2A;&#x5C31;100&#x4E2A;&#x6765;&#x7528;&#xFF0C;&#x5176;&#x5B9E;&#x4E0D;&#x8DB3;300&#x4E2A;&#x7684;&#x60C5;&#x51B5;&#x5F88;&#x5C11;&#x7684;&#xFF0C;&#x4F60;&#x60F3;Selective Search&#x90FD;&#x6709;2000&#x4E2A;&#x3002;</li>
</ul>
<h2 id="fast-rcnn">Fast RCNN</h2>
<p>&#x63A5;&#x4E0B;&#x6765;&#x5C31;&#x662F;&#x6309;&#x7167;Fast RCNN&#x7684;&#x6A21;&#x5F0F;&#x6765;&#x8BAD;&#x7EC3;&#x4E86;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x4E3A;&#x6BCF;&#x5F20;&#x56FE;&#x524D;&#x5411;&#x4F20;&#x64AD;&#x4ECE;proposal_layer&#x51FA;&#x6765;&#x5F97;&#x5230;&#x6700;&#x591A;300&#x4E2A;proposals&#xFF0C;&#x7136;&#x540E;</p>
<ul>
<li>&#x53D6;&#x4E00;&#x5F20;&#x56FE;&#x7684;128&#x4E2A;proposal&#x4F5C;&#x4E3A;&#x6837;&#x672C;&#xFF08;&#x6709;&#x6B63;&#x6709;&#x8D1F;&#xFF09;&#xFF0C;&#x4E00;&#x5F20;&#x56FE;&#x53EF;&#x4EE5;&#x53D6;&#x591A;&#x6B21;&#xFF0C;&#x76F4;&#x5230;proposal&#x7528;&#x5B8C;</li>
</ul>
<p><img src="faster_rcnn_4.png" alt=""></p>
<ul>
<li>&#x5582;&#x7ED9;Fast RCNN&#x505A;&#x5206;&#x7C7B;&#x548C;bounding box&#x56DE;&#x5F52;&#xFF0C;&#x8FD9;&#x91CC;&#x8DDF;RPN&#x5F88;&#x50CF;&#xFF0C;&#x4F46;&#x53C8;&#x6709;&#x6240;&#x4E0D;&#x540C;&#xFF0C;<ul>
<li>BB regressor&#xFF1A;&#x62DF;&#x5408;proposal&#x548C;bounding box&#xFF0C;&#x800C;&#x975E;&#x62DF;&#x5408;anchor&#x548C;bounding box</li>
<li>Classifier&#xFF1A;Object&#x591A;&#x5206;&#x7C7B;&#xFF0C;&#x800C;&#x975E;&#x524D;&#x666F;&#x80CC;&#x666F;&#x4E8C;&#x5206;&#x7C7B;</li>
</ul>
</li>
</ul>
<h2 id="&#x8FED;&#x4EE3;&#x8BAD;&#x7EC3;">&#x8FED;&#x4EE3;&#x8BAD;&#x7EC3;</h2>
<p>RPN&#x548C;Fast RCNN&#x5176;&#x5B9E;&#x662F;&#x5F88;&#x50CF;&#x7684;&#xFF0C;&#x56E0;&#x6B64;&#x53EF;&#x4EE5;&#x4E00;&#x5B9A;&#x7A0B;&#x5EA6;&#x4E0A;&#x5171;&#x4EAB;&#x521D;&#x59CB;&#x6743;&#x91CD;&#xFF0C;&#x5B9E;&#x9645;&#x8BAD;&#x7EC3;&#x987A;&#x5E8F;&#x5982;&#x4E0B;&#xFF08;MATLAB&#x7248;&#xFF09;&#xFF1A; 1. &#x5148;&#x7528;ImageNet pretrain ZF&#x6216;VGG 2. &#x8BAD;&#x7EC3;RPN 3. &#x7528;RPN&#x5F97;&#x5230;&#x7684;proposal&#x53BB;&#x8BAD;&#x7EC3;Fast RCNN 4. &#x7528;Fast RCNN&#x8BAD;&#x7EC3;&#x5F97;&#x5230;&#x7684;&#x7F51;&#x7EDC;&#x53BB;&#x521D;&#x59CB;&#x5316;RPN 5. &#x51BB;&#x7ED3;RPN&#x4E0E;Fast RCNN&#x5171;&#x4EAB;&#x7684;&#x5377;&#x79EF;&#x5C42;&#xFF0C;Fine tune RPN 6. &#x51BB;&#x7ED3;RPN&#x4E0E;Fast RCNN&#x5171;&#x4EAB;&#x7684;&#x5377;&#x79EF;&#x5C42;&#xFF0C;Fine tune Fast RCNN</p>
<p>&#x8BBA;&#x6587;&#x4E2D;&#x8FD8;&#x7B80;&#x5355;&#x8BB2;&#x4E86;&#x4E00;&#x4E0B;&#x53E6;&#x5916;&#x4E24;&#x79CD;&#x65B9;&#x6CD5;&#xFF1A;</p>
<ul>
<li>&#x5C06;&#x6574;&#x4E2A;&#x7F51;&#x7EDC;&#x5408;&#x8D77;&#x6765;&#x4E00;&#x5757;&#x8BAD;&#x7EC3;&#xFF0C;&#x800C;&#x4E0D;&#x5206;&#x6B65;&#xFF0C;&#x4F46;&#x7531;&#x4E8E;&#x4E00;&#x5F00;&#x59CB;&#x8BAD;&#x7EC3;&#x65F6;RPN&#x8FD8;&#x4E0D;&#x7A33;&#x5B9A;&#xFF0C;&#x6240;&#x4EE5;&#x8BAD;&#x7EC3;Fast RCNN&#x7528;&#x7684;proposal&#x662F;&#x56FA;&#x5B9A;&#x7684;anchor&#xFF0C;&#x6700;&#x540E;&#x6548;&#x679C;&#x5DEE;&#x4E0D;&#x591A;&#xFF0C;&#x8BAD;&#x7EC3;&#x901F;&#x5EA6;&#x4E5F;&#x5FEB;&#x3002;</li>
</ul>
<p><img src="faster_rcnn_5.png" alt=""></p>
<ul>
<li>&#x6574;&#x4E2A;&#x7F51;&#x7EDC;&#x5408;&#x8D77;&#x6765;&#x4E00;&#x8D77;&#x8BAD;&#x7EC3;&#xFF0C;&#x4E0D;&#x5206;&#x6B65;&#xFF0C;&#x8BAD;&#x7EC3;Fast RCNN&#x7528;&#x7684;proposals&#x662F;RPN&#x4FEE;&#x6B63;&#x540E;&#x7684;anchor&#xFF0C;&#x4F46;&#x8FD9;&#x79CD;&#x52A8;&#x6001;&#x7684;proposal&#x6570;&#x91CF;&#x4E0D;&#x597D;&#x5904;&#x7406;&#xFF0C;&#x7528;&#x7684;&#x662F;&#x4E00;&#x79CD;RoI warping layer&#x6765;&#x89E3;&#x51B3;&#xFF0C;&#x8FD9;&#x53C8;&#x662F;&#x53E6;&#x4E00;&#x7BC7;&#x8BBA;&#x6587;&#x7684;&#x4E1C;&#x897F;&#x4E86;&#x3002;</li>
</ul>
<h2 id="summary">SUMMARY</h2>
<p>&#x7F51;&#x7EDC;&#x7ED3;&#x6784;&#x548C;&#x8BAD;&#x7EC3;&#x8FC7;&#x7A0B;&#x90FD;&#x4ECB;&#x7ECD;&#x5B8C;&#x4E86;&#xFF0C;&#x5B9E;&#x9A8C;&#x6548;&#x679C;&#x4E5F;&#x662F;&#x4F9D;&#x6837;&#x753B;&#x846B;&#x82A6;&#xFF0C;&#x5C31;&#x4E0D;&#x518D;&#x4ECB;&#x7ECD;&#x4E86;&#xFF0C;&#x6574;&#x4F53;&#x6765;&#x8BF4;&#xFF0C;Faster RCNN&#x8FD9;&#x7BC7;&#x8BBA;&#x6587;&#x5199;&#x5F97;&#x5F88;&#x4E71;&#xFF0C;&#x5F88;&#x591A;&#x91CD;&#x8981;&#x7684;&#x7EC6;&#x8282;&#x90FD;&#x8981;&#x53BB;&#x770B;&#x4EE3;&#x7801;&#x624D;&#x80FD;&#x77E5;&#x9053;&#x662F;&#x600E;&#x4E48;&#x56DE;&#x4E8B;&#xFF0C;&#x5F97;&#x4E8F;&#x662F;&#x6548;&#x679C;&#x597D;&#x624D;&#x80FD;&#x4E2D;NIPS&#x3002;&#x3002;</p>

                                
                                </section>
                            
    </div>
    <div class="search-results">
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